Books on race and politics lead the longlist for the National Book Award in nonfiction

Mamie Till Mobley mourns over the casket of her son Emmett Till. His murder and its influence is the subject of "The Blood of Emmett Till," longlisted for the National Book Award. (Associated Press)

The 10 finalists for the National Book Award in nonfiction have been announced. They include four books directly addressing the history of race relations between blacks and whites in America; two that consider conservative forces in American culture; and one, by Naomi Klein, that advocates for progressive action during Donald Trump's presidency.